package com.test.platform.module.system.oauth2;

import com.alibaba.fastjson.JSONObject;
import com.test.common.response.BizException;
import com.test.common.response.ResultCode;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.web.filter.authc.AuthenticatingFilter;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
public class OAuth2Filter extends AuthenticatingFilter {

    @Override
    protected AuthenticationToken createToken(ServletRequest request, ServletResponse response) throws Exception {

        log.debug("createToken");

        // 获取请求token
        String token = getRequestToken((HttpServletRequest) request);
        if (StringUtils.isBlank(token)) {
            return null;
        }
        return new OAuth2Token(token);
    }

    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {

        boolean isAccessAllowed = ((HttpServletRequest) request).getMethod().equals(RequestMethod.OPTIONS.name());

        log.debug("isAccessAllowed|{}", isAccessAllowed);

        return isAccessAllowed;
    }

    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {

        log.debug("onAccessDenied");

        // 获取请求token，如果token不存在，直接返回401
        String token = getRequestToken((HttpServletRequest) request);
        if (StringUtils.isBlank(token)) {
            HttpServletResponse httpResponse = (HttpServletResponse) response;
            httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
            httpResponse.setHeader("Access-Control-Allow-Origin", "*");

            throw new BizException(ResultCode.USER_NOTLOGGED_IN.code(), ResultCode.USER_NOTLOGGED_IN.message());
        }
        return executeLogin(request, response);
    }

    @Override
    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request,
                                     ServletResponse response) {

        log.debug("onLoginFailure");

        HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.setContentType("application/json;charset=utf-8");
        httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
        httpResponse.setHeader("Access-Control-Allow-Origin", "*");
        try {
            // 处理登录失败的异常
            Throwable throwable = e.getCause() == null ? e : e.getCause();
            JSONObject responseJson = new JSONObject();
            responseJson.put("code", ResultCode.USER_TOKEN_ERROR.code());
            responseJson.put("message", ResultCode.USER_TOKEN_ERROR.message());
            httpResponse.getWriter().print(responseJson.toJSONString());
        } catch (IOException e1) {
            e.printStackTrace();
        }
        return false;
    }

    private String getRequestToken(HttpServletRequest httpRequest) {
        // 从header中获取token
        String token = httpRequest.getHeader("token");

        // 如果header中不存在token，则从参数中获取token
        if (StringUtils.isBlank(token)) {
            token = httpRequest.getParameter("token");
        }

        log.debug("token|{}" + token);

        return token;
    }

}
